Replace ERB tap with a local variable

[dreikanter]

Changes:

• Assign managed groups to an explicit ERB local before rendering the groups section.
• Remove the tap block used only to introduce that local.

Why:

A direct assignment expresses the template flow more clearly without changing output.

References:

• Related issue: Review the code structure #1010 (F-136)

Checks:

• Rendered branches and content are unchanged.
• GitHub Actions will verify the branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.55%. Comparing base (ce0547a) to head (f84835f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1093   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files         355      355           
  Lines        8358     8358           
=======================================
  Hits         8154     8154           
  Misses        204      204           

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